The e track system works for those carriers as they want quickness, universatility?, one type fits all---------

If you are going to outfit YOUR trailer to haul YOUR car, be specific and the best you can do--If you are looking for easy loading and unloading, use a set of hold down straps that are for THAT specific trailer and vehicle--------that way you aren't doing a lot of resetting lengths, etc at every loading. keep fronts at front and rears at rear, right right, left left.
Use a remote control winch for loading-no driving on and killing the clutch, getting headers/exhaust hot, etc, etc.

Straps in rear don't need to be crossed but do need to be at an angle--------

Sometimes you need to snub the car down to eliminate suspension bounce------

Locate on trailer to balance loading-set straps to spot car same place each/every time

Use the padded axle straps and no damage to painted undercarrieage

Airplane loading did seem simpler than race cars-------